Has anyone else experienced a slow down in boat performance running in shallow water/mud when it gets down into the 20F range? Usually can run 4 guys and gear no problem get 20ish speed with our Prodrive with mod exhaust. Yesterday and Today hard to even get on plain with 3 guys and gear. The river has really dropped this year and we are in about a 1ft of water and thick mud. Seems the mud has gotten really cold and tough to get through.

it don't get that cold down here. lol

Check valve lash, make sure you didn't bend or toss a pushrod.

#CFFITR
#mudmotor>physics

Valve lash abd check the condition of your prop bud

I could be misunderstanding you, but it sounds like what your talking about is your prop isn’t setting any “bite” due to hard bottom. If you have a full load your boat is naturally going to squat more and hard bottom is hell on surface drive.